Configurable photoplethysmogram system

A method for measuring optical signals by a wearable device, comprising:

• activating a first combination of optical sensors, the first combination of optical sensors comprising a set of transmitter sensors from a plurality of transmitter sensors and a set of receiver sensors from a plurality of receiver sensors of the wearable device, wherein the plurality of transmitter sensors comprise at least one transmitter sensor of a first wavelength, and at least one transmitter sensor of a second wavelength, wherein the plurality of transmitter sensors are positioned at two or more positions along a surface of the wearable device, and wherein the plurality of receiver sensors of the wearable device are positioned at least at an additional position along the surface of the wearable device;
• measuring, at the set of receiver sensors at a first time, one or more signals from the set of transmitter sensors;
• determining a signal quality metric associated with the one or more signals;
• and
• selecting a second combination of optical sensors for use at a second time based at least in part on the signal quality metric.

An apparatus for measuring optical signals by a wearable device, comprising:

• at least one processor;
• at least one memory coupled with the at least one processor;
• and
• instructions stored in the at least one memory and executable by the at least one processor to cause the apparatus to:
• activate a first combination of optical sensors, the first combination of optical sensors comprising a set of transmitter sensors from a plurality of transmitter sensors and a set of receiver sensors from a plurality of receiver sensors of the wearable device, wherein the plurality of transmitter sensors comprise at least one transmitter sensor of a first wavelength, and at least one transmitter sensor of a second wavelength, wherein the plurality of transmitter sensors are positioned at two or more positions along a surface of the wearable device, and wherein the plurality of receiver sensors of the wearable device are positioned at least at an additional position along the surface of the wearable device;
• measure, at the set of receiver sensors at a first time, one or more signals from the set of transmitter sensors;
• determine a signal quality metric associated with the one or more signals;
• and
• select a second combination of optical sensors for use at a second time based at least in part on the signal quality metric.